bisect

bisect is a skill for Claude Code from drn/dots. It costs 28 tokens per session (1,038 once invoked), scanned A, original, MIT.

A Git bisect workflow that uses binary search through a repository's commits to find which commit introduced a bug.

In plain words
What is it for?
Use it to investigate when a bug first appeared and verify each candidate commit with commands such as a test suite.
Why use it?
It narrows a long history to the change that caused the problem, using a test command or manual checks to classify commits as working or broken.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Good fit Use it to investigate when a bug first appeared and verify each candidate commit with commands such as a test suite.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/drn/dots/bisect
View source ↗ drn/dots
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add drn/dots --skill bisect
Clone the repo
git clone --depth 1 https://github.com/drn/dots

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for bisect

README.md
[![agentmods](https://agentmods.dev/badge/skills/drn/dots/bisect/github.svg)](https://agentmods.dev/skills/drn/dots/bisect)
Your own site
<a href="https://agentmods.dev/skills/drn/dots/bisect"><img src="https://agentmods.dev/badge/skills/drn/dots/bisect/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for bisect

Your own site · 80×15
<a href="https://agentmods.dev/skills/drn/dots/bisect"><img src="https://agentmods.dev/badge/skills/drn/dots/bisect.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 28 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,038 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00028 $0.01038
Opus 5.5 $0.00011 $0.00415
Sonnet 5.5 $0.00006 $0.00208
Haiku 4.5 $0.00003 $0.00104

Measured 1mo ago against content hash edebbf89d687, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

bisect scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

agents/skills/bisect/SKILL.md · 111 lines

How it starts

The opening of the file, as written. The whole thing — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Git Bisect

Find the exact commit that introduced a bug using binary search with automatic test verification.

Arguments

  • $ARGUMENTS - Required: a test command to verify the bug (e.g., "go test ./pkg/..." or "npm test"), or a description of the bug to investigate manually

Context

  • Current branch: !git branch --show-current
  • Git status: !git status --short
  • Recent commits (50): !git log --oneline -50 2>/dev/null | head -50
  • Test framework: !find . -maxdepth 1 \( -name go.mod -o -name Gemfile -o -name package.json -o -name Cargo.toml -o -name pyproject.toml \) 2>/dev/null | head -5
  • Latest tag: !git describe --tags --abbrev=0 2>/dev/null | head -1

Instructions

Step 0: Validate state

  • IF git status --short shows uncommitted changes, offer to stash them with git stash push -m "bisect: stashing before bisect". If the user declines, stop and tell them to commit or stash first.
  • IF $ARGUMENTS is empty, ask the user: "What test command should I run to detect the bug? Or describe the bug and I will check each commit manually."

Step 1: Determine boundaries

The "bad" commit is HEAD (current state where the bug exists).

For the "good" commit, ask the user or infer:

  • IF the user provides a known-good commit or tag, use it.
  • IF a latest tag exists, suggest it as the good commit: "Is the bug present in ? If not, I will use it as the good boundary."
  • OTHERWISE, suggest a commit from the recent history (e.g., 20 commits back) and ask the user to confirm.

Step 2: Start bisect

git bisect start
git bisect bad HEAD
git bisect good <good-commit>

Report how many commits are in the range and the estimated number of steps (log2).

IF the range exceeds 1000 commits, warn the user: "This is a large range ( commits, ~ steps). Consider narrowing the boundaries."

Step 3: Run bisect

IF the user provided a test command:

  • Use git bisect run <test-command> for automatic bisection.
  • The test command should exit 0 for "good" (bug not present) and non-zero for "bad" (bug present).
  • Monitor the output. IF the test command exits with 125 (skip), report that the commit could not be tested and bisect will skip it.

Read the full file on GitHub · 111 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 111 lines · 28 tokens per session scan A edebbf89d687

Subscribe to this mod's changes

bisect is a skill published in the GitHub repository drn/dots (23 stars, last pushed 11d ago), licensed MIT. It adds 28 tokens to every session and 1,038 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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